EP0107482B1 - Verfahren und Vorrichtung zur Messung der Permeabilität einer laufenden Bahn - Google Patents

Verfahren und Vorrichtung zur Messung der Permeabilität einer laufenden Bahn Download PDF

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Publication number
EP0107482B1
EP0107482B1 EP83306363A EP83306363A EP0107482B1 EP 0107482 B1 EP0107482 B1 EP 0107482B1 EP 83306363 A EP83306363 A EP 83306363A EP 83306363 A EP83306363 A EP 83306363A EP 0107482 B1 EP0107482 B1 EP 0107482B1
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Prior art keywords
web
permeability
head
sensing
traversing
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EP83306363A
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English (en)
French (fr)
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EP0107482A1 (de
Inventor
Benny Lee Hester
William Franklin Fleming Iii
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RJ Reynolds Tobacco Co
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RJ Reynolds Tobacco Co
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082—Investigating permeability by forcing a fluid through a sample
    • G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change

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  • This invention relates to measurement apparatus and methods, and more particularly to apparatus and methods for measuring permeability of cigarette papers in terms of CORESTA units.
  • CORESTA unit a standard unit of measurement
  • any successful on-line monitoring device must be capable of dealing with wide, rapid swings in permeability.
  • Graham provides a method and apparatus for evaluating the porosity of a sheet material at a given value of V or PD, with account being taken of the said relationship between the parameters of V and PD, in which one of the parameters is set a number (e.g.
  • a disclosure by Brown, U.S. Patent No. 4,253,010, is a reference-type permeability detector and control system.
  • a vacuum source regulated for constant flow, is connected to sensing means at two points, a reference point and a sample point.
  • a U-shaped manometer tube is located between these vacuum lines, so that when the sensed permeability at the two points is equal, the vacuum line pressures are equal, causing the fluid in each leg of the U to be at the same level. Differences in permeability, and hence pressure, cause one leg or the other of the U to be at a higher level than the other, which condition is sensed by photoelectric means.
  • This disclosure is incapable of solving the problem of accurate, direct readout of CORESTA permeability.
  • this is a reference-type monitor, not adapted to provide output in terms of the CORESTA permeability.
  • this disclosure shares with the patents discussed above the inherent inaccuracies of a constant-flow regulated system._FW ally, detection of pressure differentials by means of a fluid manometer cannot respond to rapid variations in pressure. The mass of the fluid possesses sufficient inertia to damp out rapid variations, allowing measurement only of average, rather than instantaneous, values.
  • apparatus for measuring the gas permeability of a continuous moving web comprising:
  • the invention also provides
  • the preferred embodiment monitors both the. pressure drop and the flow rate of a fluid passing through a sensing head in contact with the moving web.
  • the pressure differential across the web is monitored directly.
  • the volumetric flow rate is determined by directing the fluid through a laminar flow element, sensing the pressure differential across the element, and developing a signal analogous to the flow rate.
  • Calculating circuitry receives the flow rate and pressure drop signals as inputs and develops a signal directly proportional to the CORESTA value of permeability ability.
  • LED display means allow a machine operator to monitor directly values of detected permeability, as well as the average value and the range of values.
  • the preferred embodiment includes means for monitoring the permeability of a continuous moving web at sequential locations on the web.
  • Control means responsive to the cam and cam roller, cause the head to traverse from an initial position, dwell in subsequent monitoring positions, and return to the initial position. At a point in the cycle when the head is not in contact with the web, the head and associated vacuum lines are purged of accumulated dust by a pulse of compressed air.
  • the invention enables the provision of a method and apparatus for measurement of the permeability of a moving web, which is particularly suitable for measuring in CORESTA units the permeability of a wide variety of papers, such as ventilated tipping paper, used in cigarette manufacturing.
  • the method and apparatus are capable of accurately measuring the instantaneous permeability over a wide range of possible values and of sequentially measuring permeability at selected locations on a continuous moving web.
  • the invention enables a machine operator to monitor the permeability of a continuous moving web in terms of both average values and the range of values sensed.
  • V A (PD)N
  • V A(PD S )
  • VM A(PDM)
  • a permeable web 3 is fed from a feedroll 2, across a sensing head 100, to a take-up roll 6, which is driven by a power source (not shown).
  • a perforating assembly 4 is located upstream of the pressure sensing head. This assembly is necessary if the permeable web consists of cigarette tipping paper but is of course not necessary if other materials, such as tobacco rod wrapper, were to be monitored.
  • a fluid flow is established across the web, into sensing head 100, and through pneumatic line 110. Two independent measurement systems draw data from the sensing head.
  • Pneumatic line 110 feeds a volumetric flow measurement system 10 which measures volumetric fluid flow and converts that measurement into an electrical signal.
  • a separate pneumatic line 111 feeds a pressure measurement system 20 which measures pressure drop across the web and converts that value into an electrical signal. Both signals are fed to a calculating circuit 120, which performs the mathematical operations required to convert measured values into a .CORESTA value, and feeds that result to a CORESTA readout system 130. If direct feedback control of, for example, a perforating assembly, is desired, a controller 140, of a type known to the art, could be added to the system to provide such control.
  • FIG. 2 A detailed schematic of the measurement and readout systems is shown in Figure 2.
  • airflow is established by a vacuum source 12, within parameters set by a vacuum regulator 14 and metering valve 16.
  • a vacuum source 12 within parameters set by a vacuum regulator 14 and metering valve 16.
  • volumetric flow is measured in a laminar flow element 18.
  • the fluid stream is directed through a matrix of minute parallel capillary passages whose cross section is sufficiently small to produce laminar flow from the normally occurring turbulent flow of the fluid stream.
  • volumetric flow rate is directly proportional to pressure drop, permitting direct, accurate measurement of volumeric flow.
  • a suitable laminar flow element was found to be Model 50MJ10, manufactured by Meriam Instrument Division of Scott & Fetzer, 10920 Madison Avenue, Cleveland, Ohio, 44102.
  • the pressure drop across the laminar flow element is obtained by coupling the element's inlet and outlet pressure sensing ports, P L1 and P L2 , to the ports of a transducer 24 by pneumatic lines 17 and 19.
  • the transducer converts the existing pressures to an electrical signal which, after demodulation in demodulator 26, corresponds to the measured volumetric flow rate, V M .
  • a suitable transducer and demodulator are Validyne models DP-15 and CD-101, respectively, produced by Validyne Engineering Corp., 8626 Wilbur Avenue, Northridge, California, 91324.
  • a purge valve 23 Directly upstream of the laminar flow element is a purge valve 23.
  • This valve is a three-way device, whose normally-open ports are connected to the laminar flow element 18 and the vacuum line 110.
  • the normally-closed port is connected to a compressed air source 21.
  • This port is actuated by a solenoid responsive to a signal from the control system, as hereinafter explained.
  • the solenoid When the solenoid is actuated, the compressed air source is connected to vacuum line 110 and the volumetric measurement system 10 is disconnected.
  • a filter 22 is located upstream of the purge valve and communicates directly with the pressure sensing head 100 by vacuum line 110. Both the filter and the purge valve may be selected from readily available components.
  • the pressure mesaurement system 20 communicates with the pressure sensing head via vacuum line 111.
  • the pressure drop within the head is converted to an electrical signal by transducer 32, feeding demodulator 34.
  • This signal is referenced to atmospheric pressure by leaving one of the transducer ports open to atmospheric pressure, P A .
  • the demodulator output signal corresponds to the measured pressure drop, PD M .
  • Suitable components for this transducer and demodulator are identical to those listed above.
  • the value of the exponential constant N is experimentally determined for a given product and then set into the normalizing circuit 120. As mentioned above, it is known that this constant also varies with changes in PD M . We have discovered, however, that variations on the order of 10-20% do not sufficiently affect the value of N to render permeability measurements unacceptably inaccurate. We therefore provide an out-of-range indicator 40 to ensure that the average pressure in the system stays within this operating range. That result is achieved by connecting two comparators 42 and 46 in parallel with the pressure drop signal demodulator 34 output.
  • the trigger points of these comparators are chosen such that one comparator triggers when the demodulator output falls below a preselected value corresponding to the low end of the operating range, and the other triggers when the demodulator output exceeds an upper limit.
  • the comparator outputs are connected to lamps or LED's 43 and 45 to give the machine operator a visual indication of an out-of-range condition. The operator can then adjust metering valve 16 to bring the average pressure within operational limits.
  • Typical components for comparators 42 and 46 are Texas Instruments Type 339 comparators, readily available to the art. Resistive networks are chosen such that the lower limit comparator triggers at a signal corresponding to a pressure drop of .8 centibars, and the upper limit comparator triggers at values in excess of 1.2 centibars.
  • a vacuum source 12 establishes fluid flow through the volumetric flow system 10, vacuum line 110, sensing head 100, and across the web 3.
  • a metering valve 16 and vacuum regulator 14 cooperate to maintain pressure in this line at about 1.0 centibar.
  • Pressure drop across a laminar flow element 18 is converted to an electrical signal analogous to the measured volumetric flow rate, V m by transducer 24 and demodulator 26.
  • the exact pressure drop at the. sensing head 100 is converted into an electrical signal corresponding to the measured pressure drop, PD M by transducer 32 and demodulator 34.
  • An out-of-range indicator 40 ensures that the system pressure remains within operating limits.
  • the control system actuates the purge valve 23 solenoid, disconnecting the vacuum line 110 from the laminar flow element 18 and connecting it to a compressed air source 21. Compressed air then flows through the filter 22 and vacuum line 110, and out the monitoring head 100, discharging any dust which may have accumulated therein. Subsequently, the solenoid is deactivated and the vacuum line reconnected to the laminar flow element.
  • the signals V M and PD M are processed in the calculating circuit 120 to produce the CORESTA readout signal V S , as shown in the schematic of Figure 3.
  • Mathematical processing takes place in a programmable multi-function module 122. Resistive values and pin connections shown correspond to those employed on Analog Devices model 433J, available from that company at Route 1, Industrial Park, Norwood, Massachusetts, 02062. Signals PD m and V m are input through module pins 9 and 10 respectively.
  • the potentiometer 121 connected across pins 6 and 11 establishes the module's zero point, and power requirements (plus 15 and minus 15 volts) are furnished at pins 3, 4, and 5.
  • a conventional power supply 124 supplies these requirements from line voltage, but these voltages could be obtained from any suitable available source.
  • Module 122 is capable of performing a variety of mathematical operations. As here employed, it is programmed to solve the equation for volumetric flow rate at CORESTA standards.
  • the value of the exponential constant N is determined by the values of the network comprising resistors 123 and 125 connected at pins 1, 7, and 9.
  • N is first determined experimentally by measuring volumetric flow rates at several different known pressures and solving Graham's equation for N. For example, perforated cigarette tipping paper was found to have a value of N equal to .53.
  • values for the resistor network are then chosen by the formula R, being resistor 123 and R z resistor 125.
  • resistor 123 was chosen to be a potentiometer having a value of 200 ohms, in combination with a fixed resistor 125 (R z ) having a value of 80 ohms. This combination allows N to be selected within a range of values from zero to .71. This range has been found sufficient to cover all applications concerning cigarette papers.
  • the particular value of N for a selected paper is first determined experimentally, and the corresponding resistance value for the potentiometer is indicated on the potentiometer dial.
  • resistor 123 could be fixed if the device were to be employed to monitor only one type of paper. For example, an apparatus used only to monitor the permeability of perforated cigarette tipping paper could substitute a 70 ohm fixed resistor as resistor 123.
  • V s is available at pin 2. This signal may be utilized directly, but we prefer to process it further in a two-stage operational amplifier 127, such as Motorola part No. MC1458.
  • the processing required for the V s signal depends upon the input requirements of the meter, readout device, or control system which utilizes this signal as its input.
  • the components chosen here produce an output signal tailored to the requirements of the CORESTA readout device 130, discussed below. Resistance and voltage values are conventional, and were chosen as shown in Figure 3.
  • the first stage 126 of operational amplifier 127 performs a scaling function, linearly increasing the signal level.
  • the second stage 128 serves as a buffer, isolating the multi- function module output from the readout device.
  • Input to and output from the calculating circuit is accomplished through an 8-pin connector 129 or similar suitable device.
  • Pins 1 and 2 are line voltage connections, and pin 8 is the ground connection.
  • Connector pins 3 and 4 are the volumetric flow (V M ) and measured pressure drop (PD M ) inputs, respectively.
  • Pin 5 provides a direct output signal from the multifunction module; this signal is useful also in setting the module zero point.
  • Pins 6 and 7 provide the system output signal V s . Any or all of these signals may be monitored, as desired, through conventional metering means known in the art.
  • the calculating circuit output signal, V s is fed to CORESTA readout device 130.
  • This device consists of a bank of comparators 132 connected in parallel, each of whose output drives an LED 133. Resistive networks associated with the comparators, as is conventionally known, establish comparator trigger points, corresponding to given levels of signal V s .
  • the number of comparators can be chosen as a matter of design choice based upon the discrimination desired in the readout unit.
  • the comparator corresponding to the average value of V s will be triggered often, resulting in its corresponding LED being perceived as glowing continuously and brightly.
  • Other comparators in the range of sensed values will be triggered less frequently, and will be seen as glowing less brightly..
  • the corresponding LED's will be perceived as flickering.
  • the operator sees not only the average value of web permeability, but also the range of values being sensed. This form of readout enables an operator to monitor the entire process, not merely the average value of permeability.
  • the measurement and readout systems monitor the permeability of the continuous web through the action of sequential sensing apparatus 50, shown in Figures 4 and 5.
  • the particular product which is to be monitored generally governs the selection of apparatus by which the measurement and readout systems are coupled to the web.
  • the apparatus shown is adapted to monitoring perforated cigarette tipping paper, but those skilled in the art will appreciate that obvious modifications could be made to adapt it to other products, such as tobacco rod wrapper.
  • Cigarette tipping paper normally is manufactured in a relatively wide web, which is later slit into individual ribbons of tipping paper. This paper is perforated so that each ribbon of tipping paper contains one band, row, or lane of perforations, formed in selected patterns by the perforating apparatus 4, shown in Figure 1.
  • each band of perforations must be monitored. Although it is possible to provide individual sensing means for each band, the present invention accomplishes the desired result by sequentially monitoring each perforation band.
  • the sequential sensing apparatus 50 generally comprises the sensing head 100, mounted on a traversing table assembly 60, which is carried on a base 52, and associated control and drive means (not shown).
  • the base generally lies at right angles to the path of web travel.
  • Mounted on base 52 are two rollers 54, suitably journaled for free rotation in supports 56, extending outwards and upwards from each side of the base.
  • the rollers are positioned so that the web engages the underside of one roller, travels over the sensing head, engages the underside of the second roller, and feeds onto the take-up roll 6 (shown in Fig. 1).
  • the traversing table assembly 60 is mounted on the base by slides 64 which slide on blocks 66. As seen in Figure 5, the slides are circular in cross section, and the slide blocks are adapted to engage them, but any suitable slide mechanism could be used for this mounting.
  • the slides extend the length of the traversing table, and enable the table to move under the web from a start position, in which one end of the table is positioned under the web (seen in Fig. 4), to a finish position in which the other end of the table is under the web.
  • a plate 62 is carried on the slides 64, and sensing head 100 is mounted generally in the center of the plate.
  • Head rollers 70 extend on either side of the head to head roller supports 68, mounted at the ends of the plate and suitably journaled for free rotation in both the head and the head roller supports.
  • the roller diameter may be of any convenient dimension, and the roller surface should be selected to avoid marking the web.
  • the rollers are fabricated of stainless steel and have a radius of curvature equal to that of the sensing head 100, discussed below.
  • the sensing head 100 is fixed at approximately the center of the plate 62.
  • the top portion of the head (Figs. 6 and 7) has a semi-circular face 104, matching the curvature of head rollers 70.
  • a slot 102 is formed at the apex of the head.
  • Separate air passages 106 and 107 within the head communicate with the slot and passages 108 and 109 formed in the plate 62.
  • the machining of the head is particularly critical.
  • the face 104 must be absolutely smooth and flat, and rollers 70 must be mounted such that face 104 protrudes slightly above the rollers. These two requirements ensure proper contact between the face and the web, so that air flows into the slot 102 (shown as Arrow A, Fig. 6) only through the web, without leakage around the sides.
  • the cross-sectional area of the slot must be maintained within tight tolerances, so that volumetric flow rate can be calculated accurately.
  • the head face is fabricated within a tolerance of plus or minus .0005 inches (.0127 mm), and the slot is machined to have a surface area of .25 square inches (161 square mm).
  • drive and control means cause the moving table assembly to travel from a start position, where the head is aligned with the right-most row of perforations (shown in Figure 4), to an ending position, in which the head has traversed all the way across the web and the head has emerged beyond the left. edge of the web. Movement is effected by a motor 80, driving a lead screw 82, which engages a threaded receiver 94 fixed to the underside of plate 62. Rotation of the lead screw causes the threaded receiver, and thus the plate, to move transversely across the web by sliding on blocks 66.
  • a cam roller switch 84 is mounted at the end of plate 62 opposite to the motor.
  • This switch is activated by a spring-loaded finger 85 having a roller at its tip.
  • the roller engages detents 87 cut in a cam 86, mounted under the plate and parallel to its direction of movement. Adjustment of the cam back and forth along the plate's direction of travel to ensure correct cam positioning is accomplished by adjustment wheel 92.
  • the plate In its start position, the plate engages return limit switch 90.
  • the plate At its finish position, at the other end of the base, the plate engages travel limit switch 88.
  • a controller (not shown) regulates the interaction of these elements during an operational cycle, as hereinafter discussed.
  • FIG. 4 and 8 depict a complete operational cycle of the apparatus in monitoring the permeability of a moving web of perforated tipping material.
  • such webs are prepared in some multiple of a single tipping paper width.
  • Figure 8 depicts a typical web, which later will be slit into seven ribbons of tipping paper. Each such ribbon requires one row, or lane, of perforations. Therefore, the permeability monitoring apparatus must sequentially traverse to cover each of the seven lanes.
  • the apparatus is in start position A (Fig. 8), monitoring the rightmost lane of perforations, as depicted in Figure 4.
  • adjustment wheel 92 is used to ensure that the head is centered on this lane of perforations.
  • the controller causes the apparatus to dwell in position A for a preselected time.
  • motor 80 is energized, causing the head to traverse inward. to the next lane of perforations, at position B.
  • head rollers 70 ensure that the web is fully supported at all times. To minimize friction, the only non-rotating element in contact with the web is the head itself.
  • the traversing assembly 60 continues to traverse toward position B until the spring-loaded finger 85 of cam roller switch 84 engages the succeeding detent 87 on cam 86.
  • Detents are spaced on the cam according to the distribution of perforation lanes on the web; different cams can be fabricated to accommodate any pattern of lane distribution and can be substituted when changing product configuration. Thus, the apparatus is adaptable to any given spacing and pattern of performation lanes. Engagement with the detent 87 causes the cam roller switch 84 to send a signal to the controller, which then stops the motor. The head dwells in position B for a preselected time, after which the controller reenergizes the motor, causing the apparatus to traverse to the next inward lane, at position C.

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Claims (14)

1. Vorrichtung zum Messen der Gas-Permeabilität einer kontinuierlich laufenden Bahn (3), umfassend:
eine Abtaskopfanordnung (100), die in Kontakt mit der Bahn steht;
Einrichtungen (12,14) zum Hindurchleiten eines Fluidstroms durch die Bahn (30) und den Kopf (100);
Einrichtungen (10) zum Messen des volumetrischen Durchflusswertes des Fluidstroms und zum Erzeugen von dazu analogen Signalen;
Einrichtungen (20) zum Messen des Druckabfalls in dem Fluidstrom über der Bahn und zum Erzeugen von dazu analogen Signalen, wobei die Druckmessung gleichzeitig mit und unabhängig von der Strömungsmessung erfolgt;
Einrichtungen (120) zum Berechnen der Durchlässigkeit der Bahn gemäß der Formel:
Figure imgb0006
wobei N eine Konstante für das zu messende Material ist; und
Einrichtungen (130) zum Übermitteln der Ergebnisse der Berechnung in Form eines Durchlässigkeitssignals.
2. Vorrichtung nach Anspruch 1, bei der die Druchflußmengen-Messeinrichtungen umfassen:
eine laminares Strömungselement (18) und
Einrichtungen (24) zum Erfassen des Druckabfalls über dem laminaren Strömungselement und zum Entwickeln eines dazu analogen Signals.
3. Vorrichtung nach Anspruch 1 oder 2, bei der die Abtastkopfanordnung umfasst:
einen Abtastkopf (100), der so angeordnet ist, daß er in Kontakt mit der Bahn (3) steht und in dem ein Schlitz (102) zum Hindurchleiten des Fluidstroms vorgesehen ist;
Einrichtungen (104), die angrenzend an den Kopf montiert sind, um den nicht in Kontakt mit dem Kopf stehenden Teil der Bahn im wesentlichen reibungsfrei abzustützen; und
Einrichtungen (80, 82, 84 bis 88, 90, 92, 94) zum Herbeiführen einer Traversierbewegung des Kopfes in mehrere Abtastpositionen an der Bahn.
4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Traversiereinrichtungen umfassen:
einen Traversiertisch (60), der quer zu der Bahn (3) montiert ist;
eine Kurvenbahn (86), die angrenzend an den Tisch montiert ist, mit Einrichtungen zum Anzeigen aufeinander folgender Abtastpositionen;
eine Kurvenabtastrolle, welche auf der Kurvenbahn läuft;
Einrichtungen zum Erfassen des Eingriffs der Abtastrolle mit den Anzeigeeinrichtungen; und
Einrichtungen, die auf die Abtasteinrichtungen ansprechen, um die Traversierbewegung des Tisches zu steuern.
5. Einrichtung nach irgendeinem der vorangehenden Ansprüche, welche außerdem umfasst:
Einrichtungen (21,23) zum periodischen Spülen des Kopfes (100) mit Fluid zum Entfernen angesammelten Staubs.
6. Vorrichtung nach irgendeinem der vorangehenden Ansprüche, bei der die Übermittlungseinrichtungen (130) umfassen:
mehrere parallel geschaltete Komparatoren (132), von denen jeder auf einen vorgegebenen Durchlässigkeitssignalpegel anspricht; und
mehrere Licht-emittierende Einrichtungen (133), von denen jede auf das Ausgangssignal eines dieser Komparatoren anspricht.
7. Vorrichtung nach irgendeinem der vorangehenden Ansprüche, bei der die Messungen der Durchlässigkeit in CORESTA-Einheiten durchgeführt werden.
8. Verfahren zum Messen der Gasdurchlässigkeit einer kontinuierliche laufenden Bahn, weiches die Schritte umfasst:
eine kontinuierliche Bahn wird von einer Vorratsrolle über einen in Kontakt mit der Bahn stehenden Abtastkopf hinweg einer Aufwickelrolle zugeführt;
es wird eine Fluidströmung durch die Bahn und den Abtastkopt herbeigeführt;
der volumetrische Durchflußwert des Fluidstroms wird bestimmt, und es wird ein elektrisches Signal erzeugt, welches zu demselben analog ist;
der Druckabfall über der Bahn wird gemessen, und zwar unabhängig von und gleichzeitig mit der Bestimmung des Durchflußwertes;
die Durchlässigkeit der Bahn wird in Standard-Einheiten aus der Formel berechnet:
Figure imgb0007
wobei N eine Konstante für das zu messende Material ist; und
die berechnete Durchlässigkeit wird übermittelt.
9. Verfahren nach Anspruch 8, welches ferner den Schritt der Darstellung der berechneten Durchlässigkeit umfasst.
10. Verfahren nach Anspruch 8 oder 9, bei dem die Standard-Einheiten CORESTA-Durchlässigkeitseinheiten sind.
11. Verfahren nach Anspruch 8, 9 oder 10, bei dem der Schritt der Bestimmung (der Durchflußrate) ferner umfasst:
der Fluidstrom wird durch Einrichtungen zum Erzeugen einer laminaren Strömung gerichtet; und
der Druckabfall über diesen laminaren Strömungseinrichtungen wird erfasst.
12. Verfahren nach irgendeinem der Ansprüche 8 bis 11, welches ferner der Schritt umfasst, daß der Abtastkopf in Querrichtung der Bahn in mehrere Messpositionen bewegt wird.
13. Verfahren nach Anspruch 12, welches ferner den Schritt der Reinigung des Kopfes von angesammeltem Staub nach einer vorgegebenen Anzahl von Traversierschritten umfasst.
14. Verfahren nach Anspruch 12 oder 13, bei dem der Traversierschritt ein sequentielles Verweilen an ausgewählten Positionen der Bahn umfasst.
EP83306363A 1982-10-25 1983-10-19 Verfahren und Vorrichtung zur Messung der Permeabilität einer laufenden Bahn Expired EP0107482B1 (de)

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US436239 1982-10-25
US06/436,239 US4495796A (en) 1982-10-25 1982-10-25 Apparatus and method for measuring permeability of a moving web

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EP0107482A1 EP0107482A1 (de) 1984-05-02
EP0107482B1 true EP0107482B1 (de) 1986-05-14

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AU (1) AU554921B2 (de)
BR (1) BR8305884A (de)
CA (1) CA1191950A (de)
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JPS61159133A (ja) * 1984-12-31 1986-07-18 Fuji Denki Keiso Kk 濾紙空気透過度測定装置
DE3537896A1 (de) * 1985-10-24 1987-04-30 Gessner & Co Gmbh Verfahren und vorrichtung zur kontinuierlichen messung der porositaet
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BR8305884A (pt) 1984-05-29
AU1996983A (en) 1984-05-03
JPS59119241A (ja) 1984-07-10
US4495796A (en) 1985-01-29
CA1191950A (en) 1985-08-13
EP0107482A1 (de) 1984-05-02
DE3363532D1 (en) 1986-06-19
ES526706A0 (es) 1985-01-16
AU554921B2 (en) 1986-09-04
ES8502785A1 (es) 1985-01-16

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